Seiko Cal. 5644 - 738

The Seiko 5644-738 represents an important milestone in Seiko's 1981 lineup. Powered by the 5644 caliber with 19j jewels beating at 36,000 bph, it delivers a 62 hours power reserve. [seikata-wm-9c98bd1dd7ee]

Also known as: Goldfeather

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

8.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Cream

Jewels

19j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1981

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